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Date: Fri, 30 Nov 2012 20:40:27 +0000
From: Tim Golden <mail@timgolden.me.uk>
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On 30/11/2012 20:25, Ed wrote:
> to = 'ed@domain.gov'
> bcc = 'ed@domain.net'

[... snippage ...]

> smtp.sendmail(sender, [to] + bcc, msg.as_string())

Well, you crucially don't show us the rest of the traceback. But I 
imagine you'd have got something like this:

<dump>

ActivePython 2.7.2.5 (ActiveState Software Inc.) based on
Python 2.7.2 (default, Jun 24 2011, 12:21:10) [MSC v.1500 32 bit 
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> to = 'ed@domain.gov'
 >>> bcc = 'ed@domain.net'
 >>> [to] + bcc
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
TypeError: can only concatenate list (not "str") to list
 >>>

</dump>

which suggests, fairly clearly, that you're trying to concatenate a 
string and a list.

TJG